Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2078cbd68df199b8f7f6efeffa37b742f19187093274c367294c7c19c6ec1bfc' 
  AND token = '3d9Pb64mKxHesMLaXxbAzDCLFjLH6Km5f/wm1Ae7kOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}